Code Notes Secondhand Units .........................................................................................................................91 Terra Cotta ...................................................................................................................................107 Combined Units ........................................................................................................................... 119 Hollow Glass Units ......................................................................................................................132 Rubble Stone Wall Thickness ......................................................................................................143 Mortar and Glass Masonry ..........................................................................................................151 Type O Mortar ..............................................................................................................................154 Type K Mortar ..............................................................................................................................154 Grout ............................................................................................................................................156 Cold and Hot Weather Masonry .................................................................................................. 156 Wall Tie Installation ......................................................................................................................166 Minimal Nominal Wall Thickness .................................................................................................203 Corbel Projection .........................................................................................................................205 Pier Cap .......................................................................................................................................206 Cavity Walls .................................................................................................................................215 Grouting Requirements ................................................................................................................218 Stone and Masonry Veneer .........................................................................................................245 Dampproofing of Concrete and Masonry Foundations ................................................................268 Isolated Masonry Piers ................................................................................................................270 Wall Ties ......................................................................................................................................286 Grouting .......................................................................................................................................289 Chases ........................................................................................................................................293 Lintels ..........................................................................................................................................294 Corbel Projection Limitations .......................................................................................................309 Firebox Dimensions .....................................................................................................................322 Dampers ......................................................................................................................................322 Hearth Thickness .........................................................................................................................323 Footings and Foundations for Fireplaces and Chimneys .............................................................323 Chimneys .....................................................................................................................................323 Air Entrainment ............................................................................................................................335 ICF Construction ..........................................................................................................................368 Concrete Flatwork Thickness ......................................................................................................378